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Article History

Received: 29 April 2022

Accepted: 23 August 2022

First Online: 31 August 2022

Declarations

:

: The whole process and all methods of the study were performed in accordance with the relevant guidelines and regulations and all experimental protocols were approved by the Ethics Committee of Zhengzhou University. All students were informed about the aims and procedures of the study and written informed consents were received from all children’s parents before they participating in the study.

: Not applicable.

: The authors declare that they have no competing interests.